4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2007-2010, Intel Corporation
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/ieee80211.h>
17 #include <linux/slab.h>
18 #include <linux/export.h>
19 #include <net/mac80211.h>
20 #include "ieee80211_i.h"
21 #include "driver-ops.h"
25 * DOC: TX A-MPDU aggregation
27 * Aggregation on the TX side requires setting the hardware flag
28 * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
29 * packets with a flag indicating A-MPDU aggregation. The driver
30 * or device is responsible for actually aggregating the frames,
31 * as well as deciding how many and which to aggregate.
33 * When TX aggregation is started by some subsystem (usually the rate
34 * control algorithm would be appropriate) by calling the
35 * ieee80211_start_tx_ba_session() function, the driver will be
36 * notified via its @ampdu_action function, with the
37 * %IEEE80211_AMPDU_TX_START action.
39 * In response to that, the driver is later required to call the
40 * ieee80211_start_tx_ba_cb_irqsafe() function, which will really
41 * start the aggregation session after the peer has also responded.
42 * If the peer responds negatively, the session will be stopped
43 * again right away. Note that it is possible for the aggregation
44 * session to be stopped before the driver has indicated that it
45 * is done setting it up, in which case it must not indicate the
48 * Also note that, since we also need to wait for a response from
49 * the peer, the driver is notified of the completion of the
50 * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
51 * @ampdu_action callback.
53 * Similarly, when the aggregation session is stopped by the peer
54 * or something calling ieee80211_stop_tx_ba_session(), the driver's
55 * @ampdu_action function will be called with the action
56 * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
57 * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
58 * Note that the sta can get destroyed before the BA tear down is
62 static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
63 const u8 *da, u16 tid,
64 u8 dialog_token, u16 start_seq_num,
65 u16 agg_size, u16 timeout)
67 struct ieee80211_local *local = sdata->local;
69 struct ieee80211_mgmt *mgmt;
72 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
77 skb_reserve(skb, local->hw.extra_tx_headroom);
78 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
80 memcpy(mgmt->da, da, ETH_ALEN);
81 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
82 if (sdata->vif.type == NL80211_IFTYPE_AP ||
83 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
84 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
85 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
86 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
87 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
88 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
89 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
91 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
92 IEEE80211_STYPE_ACTION);
94 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
96 mgmt->u.action.category = WLAN_CATEGORY_BACK;
97 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
99 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
100 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
101 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
102 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
104 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
106 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
107 mgmt->u.action.u.addba_req.start_seq_num =
108 cpu_to_le16(start_seq_num << 4);
110 ieee80211_tx_skb_tid(sdata, skb, tid);
113 void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
115 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
116 struct ieee80211_local *local = sdata->local;
118 struct ieee80211_bar *bar;
121 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
125 skb_reserve(skb, local->hw.extra_tx_headroom);
126 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
127 memset(bar, 0, sizeof(*bar));
128 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
129 IEEE80211_STYPE_BACK_REQ);
130 memcpy(bar->ra, ra, ETH_ALEN);
131 memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
132 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
133 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
134 bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
135 bar->control = cpu_to_le16(bar_control);
136 bar->start_seq_num = cpu_to_le16(ssn);
138 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
139 IEEE80211_TX_CTL_REQ_TX_STATUS;
140 ieee80211_tx_skb_tid(sdata, skb, tid);
142 EXPORT_SYMBOL(ieee80211_send_bar);
144 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
145 struct tid_ampdu_tx *tid_tx)
147 lockdep_assert_held(&sta->ampdu_mlme.mtx);
148 lockdep_assert_held(&sta->lock);
149 rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
152 static inline int ieee80211_ac_from_tid(int tid)
154 return ieee802_1d_to_ac[tid & 7];
158 * When multiple aggregation sessions on multiple stations
159 * are being created/destroyed simultaneously, we need to
160 * refcount the global queue stop caused by that in order
161 * to not get into a situation where one of the aggregation
162 * setup or teardown re-enables queues before the other is
163 * ready to handle that.
165 * These two functions take care of this issue by keeping
166 * a global "agg_queue_stop" refcount.
168 static void __acquires(agg_queue)
169 ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
171 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
173 if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
174 ieee80211_stop_queue_by_reason(
175 &sdata->local->hw, queue,
176 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
177 __acquire(agg_queue);
180 static void __releases(agg_queue)
181 ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
183 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
185 if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
186 ieee80211_wake_queue_by_reason(
187 &sdata->local->hw, queue,
188 IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
189 __release(agg_queue);
193 * splice packets from the STA's pending to the local pending,
194 * requires a call to ieee80211_agg_splice_finish later
196 static void __acquires(agg_queue)
197 ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
198 struct tid_ampdu_tx *tid_tx, u16 tid)
200 struct ieee80211_local *local = sdata->local;
201 int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
204 ieee80211_stop_queue_agg(sdata, tid);
207 "TID %d gone but expected when splicing aggregates from the pending queue\n",
211 if (!skb_queue_empty(&tid_tx->pending)) {
212 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
213 /* copy over remaining packets */
214 skb_queue_splice_tail_init(&tid_tx->pending,
215 &local->pending[queue]);
216 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
220 static void __releases(agg_queue)
221 ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
223 ieee80211_wake_queue_agg(sdata, tid);
226 static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
228 struct tid_ampdu_tx *tid_tx;
230 lockdep_assert_held(&sta->ampdu_mlme.mtx);
231 lockdep_assert_held(&sta->lock);
233 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
236 * When we get here, the TX path will not be lockless any more wrt.
237 * aggregation, since the OPERATIONAL bit has long been cleared.
238 * Thus it will block on getting the lock, if it occurs. So if we
239 * stop the queue now, we will not get any more packets, and any
240 * that might be being processed will wait for us here, thereby
241 * guaranteeing that no packets go to the tid_tx pending queue any
245 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
247 /* future packets must not find the tid_tx struct any more */
248 ieee80211_assign_tid_tx(sta, tid, NULL);
250 ieee80211_agg_splice_finish(sta->sdata, tid);
252 kfree_rcu(tid_tx, rcu_head);
255 int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
256 enum ieee80211_agg_stop_reason reason)
258 struct ieee80211_local *local = sta->local;
259 struct tid_ampdu_tx *tid_tx;
260 enum ieee80211_ampdu_mlme_action action;
263 lockdep_assert_held(&sta->ampdu_mlme.mtx);
266 case AGG_STOP_DECLINED:
267 case AGG_STOP_LOCAL_REQUEST:
268 case AGG_STOP_PEER_REQUEST:
269 action = IEEE80211_AMPDU_TX_STOP_CONT;
271 case AGG_STOP_DESTROY_STA:
272 action = IEEE80211_AMPDU_TX_STOP_FLUSH;
279 spin_lock_bh(&sta->lock);
281 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
283 spin_unlock_bh(&sta->lock);
288 * if we're already stopping ignore any new requests to stop
289 * unless we're destroying it in which case notify the driver
291 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
292 spin_unlock_bh(&sta->lock);
293 if (reason != AGG_STOP_DESTROY_STA)
295 ret = drv_ampdu_action(local, sta->sdata,
296 IEEE80211_AMPDU_TX_STOP_FLUSH_CONT,
297 &sta->sta, tid, NULL, 0);
302 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
303 /* not even started yet! */
304 ieee80211_assign_tid_tx(sta, tid, NULL);
305 spin_unlock_bh(&sta->lock);
306 kfree_rcu(tid_tx, rcu_head);
310 set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
312 spin_unlock_bh(&sta->lock);
314 ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
317 del_timer_sync(&tid_tx->addba_resp_timer);
318 del_timer_sync(&tid_tx->session_timer);
321 * After this packets are no longer handed right through
322 * to the driver but are put onto tid_tx->pending instead,
323 * with locking to ensure proper access.
325 clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
328 * There might be a few packets being processed right now (on
329 * another CPU) that have already gotten past the aggregation
330 * check when it was still OPERATIONAL and consequently have
331 * IEEE80211_TX_CTL_AMPDU set. In that case, this code might
332 * call into the driver at the same time or even before the
333 * TX paths calls into it, which could confuse the driver.
335 * Wait for all currently running TX paths to finish before
336 * telling the driver. New packets will not go through since
337 * the aggregation session is no longer OPERATIONAL.
341 tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
342 WLAN_BACK_RECIPIENT :
344 tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
346 ret = drv_ampdu_action(local, sta->sdata, action,
347 &sta->sta, tid, NULL, 0);
349 /* HW shall not deny going back to legacy */
352 * We may have pending packets get stuck in this case...
353 * Not bothering with a workaround for now.
357 if (reason == AGG_STOP_DESTROY_STA) {
359 spin_lock_bh(&sta->lock);
360 ieee80211_remove_tid_tx(sta, tid);
361 spin_unlock_bh(&sta->lock);
368 * After sending add Block Ack request we activated a timer until
369 * add Block Ack response will arrive from the recipient.
370 * If this timer expires sta_addba_resp_timer_expired will be executed.
372 static void sta_addba_resp_timer_expired(unsigned long data)
374 /* not an elegant detour, but there is no choice as the timer passes
375 * only one argument, and both sta_info and TID are needed, so init
376 * flow in sta_info_create gives the TID as data, while the timer_to_id
377 * array gives the sta through container_of */
378 u16 tid = *(u8 *)data;
379 struct sta_info *sta = container_of((void *)data,
380 struct sta_info, timer_to_tid[tid]);
381 struct tid_ampdu_tx *tid_tx;
383 /* check if the TID waits for addBA response */
385 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
387 test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
390 "timer expired on tid %d but we are not (or no longer) expecting addBA response there\n",
395 ht_dbg(sta->sdata, "addBA response timer expired on tid %d\n", tid);
397 ieee80211_stop_tx_ba_session(&sta->sta, tid);
401 void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
403 struct tid_ampdu_tx *tid_tx;
404 struct ieee80211_local *local = sta->local;
405 struct ieee80211_sub_if_data *sdata = sta->sdata;
409 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
412 * Start queuing up packets for this aggregation session.
413 * We're going to release them once the driver is OK with
416 clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
419 * Make sure no packets are being processed. This ensures that
420 * we have a valid starting sequence number and that in-flight
421 * packets have been flushed out and no packets for this TID
422 * will go into the driver during the ampdu_action call.
426 start_seq_num = sta->tid_seq[tid] >> 4;
428 ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
429 &sta->sta, tid, &start_seq_num, 0);
432 "BA request denied - HW unavailable for tid %d\n", tid);
433 spin_lock_bh(&sta->lock);
434 ieee80211_agg_splice_packets(sdata, tid_tx, tid);
435 ieee80211_assign_tid_tx(sta, tid, NULL);
436 ieee80211_agg_splice_finish(sdata, tid);
437 spin_unlock_bh(&sta->lock);
439 kfree_rcu(tid_tx, rcu_head);
443 /* activate the timer for the recipient's addBA response */
444 mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
445 ht_dbg(sdata, "activated addBA response timer on tid %d\n", tid);
447 spin_lock_bh(&sta->lock);
448 sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
449 sta->ampdu_mlme.addba_req_num[tid]++;
450 spin_unlock_bh(&sta->lock);
452 /* send AddBA request */
453 ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
454 tid_tx->dialog_token, start_seq_num,
455 local->hw.max_tx_aggregation_subframes,
460 * After accepting the AddBA Response we activated a timer,
461 * resetting it after each frame that we send.
463 static void sta_tx_agg_session_timer_expired(unsigned long data)
465 /* not an elegant detour, but there is no choice as the timer passes
466 * only one argument, and various sta_info are needed here, so init
467 * flow in sta_info_create gives the TID as data, while the timer_to_id
468 * array gives the sta through container_of */
469 u8 *ptid = (u8 *)data;
470 u8 *timer_to_id = ptid - *ptid;
471 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
473 struct tid_ampdu_tx *tid_tx;
474 unsigned long timeout;
477 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]);
478 if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
483 timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
484 if (time_is_after_jiffies(timeout)) {
485 mod_timer(&tid_tx->session_timer, timeout);
492 ht_dbg(sta->sdata, "tx session timer expired on tid %d\n", (u16)*ptid);
494 ieee80211_stop_tx_ba_session(&sta->sta, *ptid);
497 int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
500 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
501 struct ieee80211_sub_if_data *sdata = sta->sdata;
502 struct ieee80211_local *local = sdata->local;
503 struct tid_ampdu_tx *tid_tx;
506 trace_api_start_tx_ba_session(pubsta, tid);
508 if (WARN_ON_ONCE(!local->ops->ampdu_action))
511 if ((tid >= IEEE80211_NUM_TIDS) ||
512 !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) ||
513 (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW))
516 ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
519 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
520 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
521 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
522 sdata->vif.type != NL80211_IFTYPE_AP &&
523 sdata->vif.type != NL80211_IFTYPE_ADHOC)
526 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
528 "BA sessions blocked - Denying BA session request\n");
533 * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
534 * member of an IBSS, and has no other existing Block Ack agreement
535 * with the recipient STA, then the initiating STA shall transmit a
536 * Probe Request frame to the recipient STA and shall not transmit an
537 * ADDBA Request frame unless it receives a Probe Response frame
538 * from the recipient within dot11ADDBAFailureTimeout.
540 * The probe request mechanism for ADDBA is currently not implemented,
541 * but we only build up Block Ack session with HT STAs. This information
542 * is set when we receive a bss info from a probe response or a beacon.
544 if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
545 !sta->sta.ht_cap.ht_supported) {
547 "BA request denied - IBSS STA %pM does not advertise HT support\n",
552 spin_lock_bh(&sta->lock);
554 /* we have tried too many times, receiver does not want A-MPDU */
555 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
561 * if we have tried more than HT_AGG_BURST_RETRIES times we
562 * will spread our requests in time to avoid stalling connection
565 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
566 time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
567 HT_AGG_RETRIES_PERIOD)) {
569 "BA request denied - waiting a grace period after %d failed requests on tid %u\n",
570 sta->ampdu_mlme.addba_req_num[tid], tid);
575 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
576 /* check if the TID is not in aggregation flow already */
577 if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
579 "BA request denied - session is not idle on tid %u\n",
585 /* prepare A-MPDU MLME for Tx aggregation */
586 tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
592 skb_queue_head_init(&tid_tx->pending);
593 __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
595 tid_tx->timeout = timeout;
598 tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
599 tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
600 init_timer(&tid_tx->addba_resp_timer);
603 tid_tx->session_timer.function = sta_tx_agg_session_timer_expired;
604 tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
605 init_timer_deferrable(&tid_tx->session_timer);
607 /* assign a dialog token */
608 sta->ampdu_mlme.dialog_token_allocator++;
609 tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
612 * Finally, assign it to the start array; the work item will
613 * collect it and move it to the normal array.
615 sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
617 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
619 /* this flow continues off the work */
621 spin_unlock_bh(&sta->lock);
624 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
626 static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
627 struct sta_info *sta, u16 tid)
629 struct tid_ampdu_tx *tid_tx;
631 lockdep_assert_held(&sta->ampdu_mlme.mtx);
633 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
635 ht_dbg(sta->sdata, "Aggregation is on for tid %d\n", tid);
637 drv_ampdu_action(local, sta->sdata,
638 IEEE80211_AMPDU_TX_OPERATIONAL,
639 &sta->sta, tid, NULL, tid_tx->buf_size);
642 * synchronize with TX path, while splicing the TX path
643 * should block so it won't put more packets onto pending.
645 spin_lock_bh(&sta->lock);
647 ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
649 * Now mark as operational. This will be visible
650 * in the TX path, and lets it go lock-free in
653 set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
654 ieee80211_agg_splice_finish(sta->sdata, tid);
656 spin_unlock_bh(&sta->lock);
659 void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
661 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
662 struct ieee80211_local *local = sdata->local;
663 struct sta_info *sta;
664 struct tid_ampdu_tx *tid_tx;
666 trace_api_start_tx_ba_cb(sdata, ra, tid);
668 if (tid >= IEEE80211_NUM_TIDS) {
669 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
670 tid, IEEE80211_NUM_TIDS);
674 mutex_lock(&local->sta_mtx);
675 sta = sta_info_get_bss(sdata, ra);
677 mutex_unlock(&local->sta_mtx);
678 ht_dbg(sdata, "Could not find station: %pM\n", ra);
682 mutex_lock(&sta->ampdu_mlme.mtx);
683 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
685 if (WARN_ON(!tid_tx)) {
686 ht_dbg(sdata, "addBA was not requested!\n");
690 if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
693 if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
694 ieee80211_agg_tx_operational(local, sta, tid);
697 mutex_unlock(&sta->ampdu_mlme.mtx);
698 mutex_unlock(&local->sta_mtx);
701 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
702 const u8 *ra, u16 tid)
704 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
705 struct ieee80211_local *local = sdata->local;
706 struct ieee80211_ra_tid *ra_tid;
707 struct sk_buff *skb = dev_alloc_skb(0);
712 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
713 memcpy(&ra_tid->ra, ra, ETH_ALEN);
716 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
717 skb_queue_tail(&sdata->skb_queue, skb);
718 ieee80211_queue_work(&local->hw, &sdata->work);
720 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
722 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
723 enum ieee80211_agg_stop_reason reason)
727 mutex_lock(&sta->ampdu_mlme.mtx);
729 ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
731 mutex_unlock(&sta->ampdu_mlme.mtx);
736 int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
738 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
739 struct ieee80211_sub_if_data *sdata = sta->sdata;
740 struct ieee80211_local *local = sdata->local;
741 struct tid_ampdu_tx *tid_tx;
744 trace_api_stop_tx_ba_session(pubsta, tid);
746 if (!local->ops->ampdu_action)
749 if (tid >= IEEE80211_NUM_TIDS)
752 spin_lock_bh(&sta->lock);
753 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
760 if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
761 /* already in progress stopping it */
766 set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
767 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
770 spin_unlock_bh(&sta->lock);
773 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
775 void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid)
777 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
778 struct ieee80211_local *local = sdata->local;
779 struct sta_info *sta;
780 struct tid_ampdu_tx *tid_tx;
782 trace_api_stop_tx_ba_cb(sdata, ra, tid);
784 if (tid >= IEEE80211_NUM_TIDS) {
785 ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
786 tid, IEEE80211_NUM_TIDS);
790 ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid);
792 mutex_lock(&local->sta_mtx);
794 sta = sta_info_get_bss(sdata, ra);
796 ht_dbg(sdata, "Could not find station: %pM\n", ra);
800 mutex_lock(&sta->ampdu_mlme.mtx);
801 spin_lock_bh(&sta->lock);
802 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
804 if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
805 ht_dbg(sdata, "unexpected callback to A-MPDU stop\n");
809 if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
810 ieee80211_send_delba(sta->sdata, ra, tid,
811 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
813 ieee80211_remove_tid_tx(sta, tid);
816 spin_unlock_bh(&sta->lock);
817 mutex_unlock(&sta->ampdu_mlme.mtx);
819 mutex_unlock(&local->sta_mtx);
822 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
823 const u8 *ra, u16 tid)
825 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
826 struct ieee80211_local *local = sdata->local;
827 struct ieee80211_ra_tid *ra_tid;
828 struct sk_buff *skb = dev_alloc_skb(0);
833 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
834 memcpy(&ra_tid->ra, ra, ETH_ALEN);
837 skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
838 skb_queue_tail(&sdata->skb_queue, skb);
839 ieee80211_queue_work(&local->hw, &sdata->work);
841 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
844 void ieee80211_process_addba_resp(struct ieee80211_local *local,
845 struct sta_info *sta,
846 struct ieee80211_mgmt *mgmt,
849 struct tid_ampdu_tx *tid_tx;
853 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
854 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
855 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
857 mutex_lock(&sta->ampdu_mlme.mtx);
859 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
863 if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
864 ht_dbg(sta->sdata, "wrong addBA response token, tid %d\n", tid);
868 del_timer_sync(&tid_tx->addba_resp_timer);
870 ht_dbg(sta->sdata, "switched off addBA timer for tid %d\n", tid);
873 * addba_resp_timer may have fired before we got here, and
874 * caused WANT_STOP to be set. If the stop then was already
875 * processed further, STOPPING might be set.
877 if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
878 test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
880 "got addBA resp for tid %d but we already gave up\n",
886 * IEEE 802.11-2007 7.3.1.14:
887 * In an ADDBA Response frame, when the Status Code field
888 * is set to 0, the Buffer Size subfield is set to a value
891 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
892 == WLAN_STATUS_SUCCESS && buf_size) {
893 if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
895 /* ignore duplicate response */
899 tid_tx->buf_size = buf_size;
901 if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
902 ieee80211_agg_tx_operational(local, sta, tid);
904 sta->ampdu_mlme.addba_req_num[tid] = 0;
906 if (tid_tx->timeout) {
907 mod_timer(&tid_tx->session_timer,
908 TU_TO_EXP_TIME(tid_tx->timeout));
909 tid_tx->last_tx = jiffies;
913 ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
917 mutex_unlock(&sta->ampdu_mlme.mtx);